The Guardian, often accused of bias by pro-Israel lobby groups, is excluding Palestinian voices from its comment pages, an examination of two years of coverage has revealed.

Out of 138 op-eds on Palestine/Israel published by the paper in its ‘Comment is free’ section from October 2013 to November 2015 (which includes both print and online-only articles), just 20 were written by Palestinians – 15 per cent of the total.